Effect of two resin levels on the properties of commercial southern OSB

The effect of two resin levels of liquid phenol-formaldehyde, 4.5 and 6.5 percent resin solids, on certain physical and mechanical properties of commercially fabricated oriented flakeboards was determined at 65 percent relative humidity (RH), 72?F; after 48-hour soaking; and after soaking and then reconditioning back to original condition. In general, board properties improved at the higher resin level. At the original condition, observed improvement ranged from 6 percent in internal bond (IB) strength to 14 percent in modulus of rupture (MOR) perpendicular; however, these increases were not statistically significant. At the cycled condition, increased resin level significantly increased the MOR-parallel (15%), MOR-perpendicular (33%), modulus of elasticity (MOE)-perpendicular (23%), and the IB (25%). The average strength retention after cycling was 66 percent; boards with 6.5 percent resin had approximately 10 percent higher strength retention than the boards with 4.5 percent resin. Dimensional changes were generally less at 6.5 percent than at the lower resin level.

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